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Explain how the Touch-Tone Telephone works when we dial a number; how it is transmitted to...

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Electrical Engineering

Explain how the Touch-Tone Telephone works when we dial anumber; how it is transmitted to the telephone office.

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The DTMF telephone keypad is laid out in a 44 matrix of push buttons in which each row represents the low frequency component and each column represents the high frequency component of the DTMF signal Pressing a key sends a combination of the row and column frequencies For example the key 1 produces a superimposition of tones of 697 and 1209 hertz Hz Initial pushbutton designs employed levers so that each button activated two contacts    See Answer
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